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  <title>Document</title>
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  <style>
    * {
      box-sizing: border-box;
    }

    .grid {
      height: 400px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      padding-left: 1px;
    }

    .grid-item {
      border: 1px solid sandybrown;
      margin-bottom: -1px;
      margin-right: -1px;
      text-align: center;
    }
  </style>
</head>

<body>
  <input type="date">
  <h2 style="margin: 0;">边框重叠</h2>
  <div>
    <div class="grid">
      <div class="grid-item"></div>
      <div class="grid-item"></div>
      <div class="grid-item"></div>
      <div class="grid-item"></div>
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      <div class="grid-item"></div>
    </div>
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  <!-- <script src="./index.js"></script> -->
  <!-- <script src="./b.js"></script> -->
  <script type="module" src="./moduleA.js"></script>
</body>

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